| Value | Category | Cases | |
|---|---|---|---|
| 2007 | 12 |
1.1%
|
|
| 2008 | 135 |
12%
|
|
| 2009 | 321 |
28.5%
|
|
| 2010 | 329 |
29.2%
|
|
| 2011 | 325 |
28.8%
|
|
| 2012 | 5 |
0.4%
|
|
| 9999 | Missing | 0 |
0%
|
| Sysmiss | 1205 |